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Abstract

Disclosed is a structure of sub-yoke and armature for stored energy printhead. This structure enables printhead to be low power consumption and high throughput. This structure has a trapezoid armature and taperedk sub-yoke to obtain variable gap between an armature and a sub-yoke according to armature movement.

Country

United States

Language

English (United States)

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This is the abbreviated version, containing approximately
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Structure of Stored Energy Type Printhead

Disclosed is
a structure of sub-yoke and armature for stored
energy printhead. This structure enables
printhead to be low power
consumption and high throughput. This
structure has a trapezoid
armature and taperedk sub-yoke to obtain variable gap between an
armature and a sub-yoke according to armature movement.

In Fig. 1, a
magnetic circuit consists of a core 7, a permanent
magnet 6 a yoke 5, sub-yoke 4 and an armature 2. This is
accomplished by attracting a spring 3 to the pole of the permanent
magnet 6. The spring 3 is released by
using a bucking coil 1 to
counteract the flux of the permanent magnet 6.

When the
armature 2 is settled on the pole, a gap 8 is minimum.
The gap 8 increases according to the armature 2 releasing from the
pole. This means that the magnetic
permeance is variable by the
armature displacement.

Fig. 2 shows
the relationship between magnetic force and
armature displacement. In Fig. 2, line 1
is a spring force, line 2
is a magnetic force of flat(non-tapered) armature, and line 3 is a
magnetic force of trapezoid armature.
Line 3 means that the
trapezoid armature reduces an excess of magnetic force. As the
result, this structure enables print head to be low power
consumption.